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Security Service (Sicherheitsdienst, SD) SS
The Security Service (SD) was established in 1931 by Himmler and was originally intended to act as the NSDAP's internal intelligence organisation. Later it became instrumental in the surveillance of political adversaries. The SD had an extensive network of spies and liaison people and cooperated closely with the Gestapo - at the same time monitoring it closely, as with all other party organisations.
During the Nuremberg trials, the SD was denounced as an SS organisation. After 1945, some SD members resurfaced in Western secret services. The SD had two branch offices in Klagenfurt/Celovec: one in Fromillerstrasse, behind today's Bundespolizeidirektion (federal police directorate), which was in charge of coordinating activities, and a field office in Pernhartgasse.
⇒ read on: Police prison - St. Ruprechterstraße